[firebaseai] Rename FirebaseAIExample to FirebaseAISample and update README

[YoungHypo]

1. Renamed all occurrences from FirebaseAIExample to FirebaseAISample to fix a naming inconsistency. The FirebaseAIExample appears to be a typo, shoule be FirebaseAISample.
2. Added instructions for enabling Gemini APIs in the Firebase Console.

[gemini-code-assist]

Summary of Changes

Hello @YoungHypo, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing the clarity and usability of the firebaseai project. It addresses a minor but important naming inconsistency by standardizing the project and bundle identifier from 'Example' to 'Sample', and significantly improves the project's setup documentation by including a vital step for enabling Gemini APIs.

Highlights

• Naming Consistency: Renamed all occurrences of FirebaseAIExample to FirebaseAISample across the Xcode project files and documentation to correct a typo and ensure consistent naming for the sample application.
• Documentation Update: Added a new step to the README.md providing crucial instructions on how to enable Gemini Developer API and Vertex AI Gemini API in the Firebase Console, improving the setup experience for new users.

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[gemini-code-assist]

Code Review

This pull request renames FirebaseAIExample to FirebaseAISample to improve naming consistency and updates the README with instructions for enabling Gemini APIs. The changes are well-executed and enhance the user experience.

[paulb777]

@YoungHypo thanks for the PR to improve the consistency of the Samples.

The CI scripts will also have to be updated to run correctly.

[paulb777]

On second thought, "Example" is consistent with the rest of the quickstarts in this repo. So I don't think we want to proceed with this.

I'll close, but welcome to continue the conversation here.

[andrewheard]

On second thought, "Example" is consistent with the rest of the quickstarts in this repo. So I don't think we want to proceed with this.

I'll close, but welcome to continue the conversation here.

I agree with @paulb777 though we could change everything to FirebaseAIExample, rather than FirebaseAISample, since we do have a mixture of those two names in this quickstart.

[YoungHypo]

Totally agree. If you think it’s necessary, I'd love to rename all instances of FirebaseAISample to FirebaseAIExample to ensure consistency across the project. @paulb777 @andrewheard

[paulb777]

Making it consistent would be a good improvement, so we'd be happy to review a PR.